/Engine/Source/Developer/ToolWidgets/Public/Filters/SBasicFilterBar.h
Handler for when a checkbox next to a custom text filter is clicked
void CustomTextFilterClicked ( ECheckBoxState CheckBoxState, [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [ICustomTextFilter](API\Developer\ToolWidgets\Filters\ICustomTextFilter)< FilterType >> Filter )